Date: 8 Mar 1997 00:00:01 CST
One probable explanation is that your program is using IrisGL
(sometimes referred to as just "GL") rather than OpenGL. Starting
with Impact graphics, SGI graphics hardware is optimized for native
OpenGL. IrisGL calls are executed through an emulation layer known
as IGLOO, or "IrisGL On OpenGL." This layer of emulation reduces
performance.
The best solution is to port your program to OpenGL.

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